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Finding the Fourth Proportional to 261.16, 391.72 and 153.72

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Solution

The fourth proportional to 261.16, 391.72 and 153.72 is: 230.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.16 : 391.72 = 153.72 : x
  2. Step 2: Convert to fraction form
    261.16/391.72 = 153.72/x
  3. Step 3: Cross multiply
    261.16x = 391.72 × 153.72
  4. Step 4: Simplify right side
    261.16x = 60,215.20
  5. Step 5: Solve for x
    x = 60,215.20/261.16
  6. Step 6: Final answer
    x = 230.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.